Version 2.3.2 Generated Using Latest Swagger Spec. (wavefrontHQ#43)

* Version 2.3.2 Generated Using Latest Swagger Spec.

Command Used:
```
$ java -jar ~/swagger-codegen-cli-2.3.1.jar generate -i https://mon.wavefront.com/api/v2/swagger.json -l python --git-user-id wavefrontHQ --git-repo-id python-client -D packageName=wavefront_api_client,packageVersion=2.3.2,packageUrl=https://github.com/wavefrontHQ/python-client
```

* Replace 'async' With 'async_req' for Python 3.7

Python 3.7 has added `async` as a reserved word.
Replaced `:%s/\<async\>/async_req/g` as needed.

Fixes wavefrontHQ#45

* Updated the README.md

Fix package name (wavefrontHQ#27)

Merge pull request wavefrontHQ#22 from basilisk487/master

Upgrade to version 2.2.1 (2017-32.x)